What is essential to accurately determine a customer's age when checking ID?

To accurately determine a customer's age when checking an ID, it is crucial to look at the date of birth and add 21 years. This method provides a straightforward calculation to verify whether the individual meets the legal drinking age requirement of 21 years old. By finding the date of birth on the ID and performing this simple addition, you can effectively ensure compliance with alcohol service laws.

While considering a customer's appearance might provide a general impression, it is not a reliable method for determining age, as individuals can vary significantly in appearance regardless of age. Checking solely for security features like a hologram is important for verifying the authenticity of the ID, but it does not confirm the customer's age on its own. Asking the customer directly for their age is not only inappropriate in a professional setting but also fails to provide a definitive or legally acceptable proof of age. Thus, looking specifically at the date of birth and performing the necessary calculation is the most accurate and accepted approach.